Pipe and nut wrench.



P. MASTBRSON.

PIPE AND NUT WRENOH.

APPLICATION FILED AUG; 27. 1909.

Patented Nov. 1, 1910.

miiilm Push 5- Fl El- 7 WITN SE5 INVENTDH I F' MASTEHSDN BY V AT TY.

PATRICK MAsrEnsom or COBALT, ONTARIO, CANADA.

PIPE AND NUT WRENCH.

Specification of Letters Patent.

Application filed August, 27, 1909.

Patented Nov. 1, 1910.

Serial No. 514,910.

To all whom it may concern:

Be it known that I, PATRICK MASTERSON, of Cobalt, in the Province of Ontario, Canada, have invented certain new and useful Improvements in .Pipe and Nut renches, of which the following is a specification.

My invention relates to improvements in pipe and nut wrenches, and the objects of my invention are to provide a wrench of extreme simplicity and few parts, having spring operated jaws in which the life of the spring may be increased, and no undue pressure brought thereon; and its consists essentially of a shank having teeth formed on the end thereof, a movable jaw, a plurality of links connecting the movable aw with the shank, one of the links having a projection thereon, a flat spring on the handle extending around a pin on the handle and abutting the projection on one of the links, all as hereinafter more fully set forth and described in the accompanying specification and drawings.

In the drawings :Figure 1 is a perspective view of the wrench. Fig. 2 is a side View of the same. Fig. 3 is a top View. Fig. 4 is a plan view of the shank and spring. Fig. 5 1s a plan view of the forward pair of links extendin between the movable jaw and the shank. ig. 6 is a plan view of the movable jaw. Fig. 7 is a plan view of the rear links extendlng between the movable jaw and the shank.

In the drawings, like figures of reference indicate corresponding parts in each figure.

Referring to the drawings, A represents the shank of suitable shape and material having gripping teeth 10 formed on one end of the same.

B is the movable jaw, formed as usual, with gri ping teeth 11 and connected to the shank by means of two pairs of links 12 and 13. The forward pair of links 12 are crescent shaped whereby when the jaw is opened it will not interfere with the nut or pipe being gripped. One link of the pair of links 13 has a projection 14; thereon which is engaged by the round end 15 on a flat spring 16 which spring has the opposite end 17 turned and secured to the shank A, the said spring being bent around a pin 18 on the shank, whereby it will normally tend to return the movable jaw to closed position.

In'using thewrench, the movable jaw is opened as indicated in'dotted lines in Fig. 3, and placed about the pipe, nut or the like to e tightened. The spring 16 will force the jaws into tight engagement with the artlcle to be gripped, and the turning movement of the shank will only cause the jaws to grip firmer.

A wrench constructed as described will be found to possess many advantages in practice and to be an extremely handy and effective form of wrench which will accommodate nuts or pipes from an extremely small diameter to a large diameter. For instance, an ordinary form of such wrench will grip nuts from of an inch to 3 inches, or pipes from i: of an inch to 2% inches. Owing to the spring means for actuating the jaws, the said jaws are always held in tight engagement with the pi e or nut and the wrench is ready for imme iate action. The working parts are few and not likely to wear out or need repairing. With the wrench it is possible to reach and do work in corners which it would be difficult to reach with another type of wrench. Owing to the quick grip which the wrench takes on the work it only needs a very slight movement of it to turn the pipe or nut, and consequently, even if there is only a fraction of an inch to move the wrench in, it would be enough to effect operation.

It will be observed that the spring is not likely to wear out as very little pressure is brought to bear on the same.

The wrench could be made in a variety of sizes to suit different classes of work.

In 0 crating on nuts, it is not necessary to hold t 1e wrench at right angles to the nut, as, owing to the quick spring gripping action, it will grip the nut at any angle.

As many changes could be made in the above construction, and many apparently widely different embodiments of my invention, within the scope of the claims, could be made without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying specification and drawings shall e lnterpreted as illustrative and not in a limiting sense.

What I claim as my invention is 1. A wrench of the character described comprising a shank having gripping teeth thereon, a movable jaw, a plurality of pairs of links connecting the jaw and the shank and a spring extending between the shank and one of the links of one of the pairs and normally forcing the movable jaw to closed position.

2. A wrench for the purpose specified comprising a shank having gripping teeth thereon, a movable jaw, a plurality of pairs of links connecting the movable jaw with the shank, the outermost pair of said links being crescent-shaped, whereby it will accommodate a pipe or nut held'between the edges, and spring means forforcing; the movable jaw to closed position.

3. A wrench for the purpose specified, comprising a shank having gripping teeth thereon, a movable jaw, a pluralityof pairs of links connectingthe jaw and the shank, one of said pairs of links having a projece tionthereon, and a spring extendingbetween the shank and the projection and normally forcing the movable jaw to closed position. 4-, A wrench for. the purpose specified comprising a shank having gripping teeth thereon, a movable jaw, a plurality of pairs of links connecting the shank and movable jaw, the innermost pair of said links having a projection thereon, a pin on the shank, and a flat spring secured at one end of the shank and extending around the pin and having the opposite end engaging the projection on the link substantially as hereinbefore described.

In witness whereof I have hereunto set my hand in the presence of two witnesses. PATRICK MASTERSON.

lVitnesses GEO. L IITGIL LL, KURB STAI. 

